Adjustable jack



M. P. HOLMES ADJUSTABLE JACK Dec. 16, 1930.

Filed July 20, 1928 fiwenior: 1077ZKRHOZ7728X 9 AM) 4-W- mml Patented Dec. 16, 1930 V which the invention ma UNITED STATES-f I MORRIS r.

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HOLMES; or oLAREMoNr, 1vEw;nAMi sHI-RE, hssIsivonrmo s ULLIvAN .MACHINEBY COMPANY, AcoRroRA'rIonoF MAssncnUsE'rTs a ADJUSTABLE QTACXQ;

Application filed July: 2o,

This invention relates toadjustablejacks and more particularly'pertains to an adjust ablezroofjack'especially adapted to use in" mines. I I

An object of this invention is to provide" an improved adjustable jack. Anotherobject is to provide'an improvedmining jack which is of exceedingly simple and rugged construction and which may be set up and taken down quickly and with facility." These and other objectsand advantages of this invention will, however, subsequently more fully appear.

In the accompanying drawing there is. shown for purposes of illustration one form y assume in practice. In this drawing,'

Fig. lis a longitudinally extending sec tional view; partially in elevation, illustrating onefQrmof the improved jack.

Fig. 2 is'a transverse sectional viewtaken on. line 2-2 of Fig. 1." f I a Fig. 3 is a fragmentary view taken on the same plane as'Fig. land showing the parts in a different position. V

Fig. 41s a perspective view illustrating a part of the improved adjusting means.

Fig. 5 is an elevational view illustrating the jack set up in operative position infa" mine.

In this illustrative embodiment of the in vention thereis shown an-i adjustable mine jack generally designated 1- having improved adjusting means 2. The improved ack; com prises a main tubular body 3'having suitably fixed thereto at its upperend a member 4; Pivotally connected at 5 to the member 4 is an adjustable abutment or supportengaging member 6 having serrations on-its upper surface adapted to engage suitableblocking or the mine roof. As shown fixed as by rivetsor hereincomp'rises an'adjusting nut 11 thread- 1928. .serjiaij n). 294,092. j

edly connected by :right hand 7 threads as at I 12 within a-bore formed within a boss 13 projecting laterallv from the housing '10.- viis-shov'vn this adjusting nut 11 haspivot'ally connected thereto at 1 1 a handlemember 15. The rint 11 is l in turn threadedly connected at 16 by left; hand threads to a nut member 17 slidably mountedwithin a chamber or lateral recess 18 formed within the housing. 7 As shown in Fig. 2 the-nutmernber17 is held against rotative movement by means of a pin 19 secured within the housing and projecting at its inner'end' within a groove or 'slot 20' formed, in the side of the nut member. This vided at its outerjor lower end with an abutment engaging memberor foot piece 24 having spaced'points 25 for maintaining the adjusting screwj against "rotative movement during-adjustment of the jack. -This-foot piece is-engageable with ;"suitable blocking or the mine floor. fArranged' diametrically opposite fromthe handle member 15 and piv- I gagement- Iwith the adjusting screw as shown in Fig.-3*=thereby permittingth'e adjusting screw to slide freely downwardly until the foot piece 24' engages the blocking or the mine fiooi'i The. operator then again rotates the I adj us'ting nut 11 thereby imovingthe 'nut 17 9 axially. inwardly into en gagement with the adjusting screw as shown in Fig. 1, the teeth on thenut 17 meshing'withthe teeth on the V adjusting screw at that time; It will be noted that th'e'ri-ght and left hand th'reads 12 and 16 respectively will give the eifeot of a double screw, making it necessary to rotate the handle only a very small amount in order to move the nut 17 the desired distance. The operator then swings the handle member 15', and 27 from the dottedline positions shown in;Fig; 1- to-ithefull line-post.- tions and then bodily rotates the housing 10 relative to the tubular jack body thereby causing the nut 1 7 to feedthe adjusting: screw 22 outwardly thereby forcing the a-tl justing screw and tubular jack body apart and' 'as a result the jack is rigidly-held in position. .The nut 17 prevents separation between the adjusting screw and the jack? bed-y when thejack isso positioned; o When it isdesiredto take down the jack the operaitor merely rotates'theihousing 10 relative to; the jack body thereby loosening the jack parts-,and thereafter releasing thenut l7 fromfenga-gement with the adjusting screw permitting the latter to be slid freely inwardly within. thejack body. Theadjusting screw maybe held in its inner or retracted position by the nut 17.

, Asa result. of my invent on it will be noted;

thatian improvedadjustable jack is provided whichis composedof a relatively few partsfof 7 simple :yet rugged construction especially adapted-to withstand the severe usage ens ccuntered' andzwhich may; be adjusted expeditiously and withfacility. Furthermore it will be'noted that. due to the exceedingly simple construction of, the jack itmayfbe.

manufactured at a -mini1num iof egrpense; These and other uses and advantages of, my

7 V invention will be-clearly apparent to those skillediinthis am, i V H WVh-ile-I have in this applicationvspecificcally described one'form-which the invention. may assume in practice, it will be understood that this form of vthe sameis shown for purposes-ofillustration and that therinventiom may lie-modified, and embodied invarious other forms without departing from; its

spirit or. the; scope of the appended claims.

r v jiistmentof said screw relative to said'body' What I claim as new and desire .to-secure:

bylLettersPatent is: 1

I 1-.v An adjustable. jack comprising-a.ftubu-- lar body an adjusting screw telescopically arrangedtherein, andmeansfor effecting adcoinprising a housing member rotatablymountedon said body and'having a lateral recess, a nut-slidably mounted insaid recess" and; engageable w1thsaid screw, means'yfor adjusting said nutinto and out of engagement with said screw, and meansi for IOll-{Ltg in" said body,-said body and screw being capaible ofv freetelescopic movementwhen said nut isoutofjengagement with said screw;

7 2. Anladjustable jack. comprising ,a tubularbody, an adjusting screw telescopically arranged-therein, and means for effectingiadr jnstment of said. screw relative to 'said body comprising a housing member rotatably 'mounted on; said body and having a lateral recess, a nut slidably mounted in said recess, threaded means for adjusting said nut into and out of engagement with said screw, and means. for rotating said body, said housing member. andlscrew being; capable of free 'telescopic movement when said nut is out of engagement with said screw; 7 V

:3. adjustable j'ack comprising a tubu-' 'lar body, 'an -ad justi'ngscrew telescopically a rranged therein, and means for effecting adjustment of said screw relative to said body comprising a housing member rotatably mounted on saidb'ody and having a lateral recess, a nut slidably mounted in: said recess, threadedmeans for adj usting-saidnut into zindoutcf engagement with said screw and means for rotating said body including a haridle-pivotally connected-to said threaded means An adjustable jack comprising a-tubular.- body, an adjusting screw telescopically arranged therein, and means for effecting adjustment of said screw relative to said body com-prising a housing member rotatably-fmountedon said body and having a; lat. eral recess, a nut slidably mounted in said recessythr eaded means. for adjusting said nn-t. l-ntoaand out of engagement. wlth sa d of free telescopic movement when saidinut.

is outi' of; engagement with; said-screw.

" '6. An! {adjustable-j ack comprising a. tubu lairv bedy, anfadjusting screw telescopically.

arranged; therein, a' flanged collar fixed to saiidgbodyt andhaving a guidevvay, a housing membe znotatably mounted in} said guideway and havinga. radial recess, a nutslidablymountedeinisaidrecess,-means connected to 7 said housin-gm'ember rfortad ustin'g saldnut into and; out of engagement with said screw, and means for rotating said housingmember, saidnut adjusting meansand said housi-ng rotating; means including-a common "handle member. 7 t V A, y

'Z. Agni adjustable jaclccomprising a, body Y 7 member, aniadjusting screw adaptedto be telescopically received in said member, asecond member rotatably. carried bylsaid .body member. and havinga lateral recess therein,, a. nutslidably receive'djin said recesslcomprising an arcuate threaded segment adapted to engage the threads on said screw, means for adjusting said nut into and out of engagement with said screw comprising a handle carrying member having a threaded connection with said recess, and means'for connecting said handle carrying member to said nut.

8. An adjustable jack comprising a body member, an adjusting screw adapted to be telescopically received in said member, a second member rotatably carried by said body member and having a lateral recess therein, a nut slidably received in said recess comprisingan arcuate threaded segment adapt ed to engage the thread on said screw, means i for adjusting said nut into and out of en gagement with said screw comprising a ban dle carrying member having a threaded con-' nection with said recess, and means for-iconnecting said handle carrying member to said nut, said last mentioned means comprising 7 a threaded connectlon between said handle carrying member and said nut, one of said threaded connections having left hand threads and the other right hand threads.

In testimony whereof I affix my signature.

MORRIS P. HOLMES. 

